| 摘要 |
A circuit breaker comprises first and second main contacts (14,16) relatively movable between closed and open positions, and, when closed, forming part of a main current path through the circuit breaker. First and second arcing contacts (30,32) form part of an arc current path through the circuit breaker, and contact movement is effected so that during opening of the breaker the main contacts separate and an arc is located between the first and second arcing contacts. The first arcing contact (30) is annular, and the second arcing contact (32) lies in the space within the open centre of the annular contact. An arc-driving coil (28) surrounds the annular contact and is connected in series therewith in the arc current path. The second arcing contact and a conductor assembly connected thereto, which assembly forms part of the arc current path, are substantially symmetrical with respect to the radial mid- plane of the coil. |
